AN4043 datasheet(17/60 Pages) STMICROELECTRONICS

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AN4043

Electrical characteristics and functions

Doc ID 022726 Rev 2

17/60

2.3.1

Logic inputs

The high voltage gate driver IC has two logic inputs, HIN and LIN, to separately control the

high-side and low-side outputs, HVG and LVG. Please refer to

Table 1 for the input signal

logics by device.

In order to prevent any cross conduction between high-side and low-side IGBT, a safety time

(dead time) is introduced (see

Section 2.3.4: Dead time and interlocking function

management for further details).

All the logic inputs are provided with hysteresis (~1 V) for low noise sensitivity and are

TTL/CMOS 3.3 V compatible. Thanks to this low voltage interface logic compatibility, the

SLLIMM-nano can be used with any kind of high performance controller, such as

microcontrollers, DSPs or FPGAs.

As shown in the block diagrams of

Figure 10 and Figure 11, the logic inputs have internal

pull-down (or pull-up) resistors in order to set a proper logic level in the case of interruption

in the logic lines. If logic inputs are left floating, the gate driver outputs LVG and HVG are set

to low level. This simplifies the interface circuit by eliminating the six external resistors,

therefore, saving cost, board space and number of components.

Figure 9.

High voltage gate driver block diagram

AN4043 Datasheet(PDF) 17 Page - STMicroelectronics